diff --git a/maubot/testing/__init__.py b/maubot/testing/__init__.py
new file mode 100644
index 0000000..1fcdfc0
--- /dev/null
+++ b/maubot/testing/__init__.py
@@ -0,0 +1,17 @@
+# maubot - A plugin-based Matrix bot system.
+# Copyright (C) 2023 Aurélien Bompard
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+from .bot import TestBot, make_message  # noqa: F401
+from .fixtures import *  # noqa: F401,F403
diff --git a/maubot/testing/bot.py b/maubot/testing/bot.py
new file mode 100644
index 0000000..d07ef2b
--- /dev/null
+++ b/maubot/testing/bot.py
@@ -0,0 +1,99 @@
+# maubot - A plugin-based Matrix bot system.
+# Copyright (C) 2023 Aurélien Bompard
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+from dataclasses import dataclass
+import asyncio
+import time
+
+from maubot.matrix import MaubotMatrixClient, MaubotMessageEvent
+from mautrix.api import HTTPAPI
+from mautrix.types import (
+    EventContent,
+    EventType,
+    MessageEvent,
+    MessageType,
+    RoomID,
+    TextMessageEventContent,
+)
+
+
+@dataclass
+class MatrixEvent:
+    room_id: RoomID
+    event_type: EventType
+    content: EventContent
+    kwargs: dict
+
+
+class TestBot:
+    """A mocked bot used for testing purposes.
+
+    Send messages to the mock Matrix server with the ``send()`` method.
+    Look into the ``responded`` list to get what server has replied.
+    """
+
+    def __init__(self, mxid="@botname:example.com", mxurl="http://matrix.example.com"):
+        api = HTTPAPI(base_url=mxurl)
+        self.client = MaubotMatrixClient(api=api)
+        self.responded = []
+        self.client.mxid = mxid
+        self.client.send_message_event = self._mock_send_message_event
+
+    async def _mock_send_message_event(self, room_id, event_type, content, txn_id=None, **kwargs):
+        self.responded.append(
+            MatrixEvent(room_id=room_id, event_type=event_type, content=content, kwargs=kwargs)
+        )
+
+    async def dispatch(self, event_type: EventType, event):
+        tasks = self.client.dispatch_manual_event(event_type, event, force_synchronous=True)
+        return await asyncio.gather(*tasks)
+
+    async def send(
+        self,
+        content,
+        html=None,
+        room_id="testroom",
+        msg_type=MessageType.TEXT,
+        sender="@dummy:example.com",
+        timestamp=None,
+    ):
+        event = make_message(
+            content,
+            html=html,
+            room_id=room_id,
+            msg_type=msg_type,
+            sender=sender,
+            timestamp=timestamp,
+        )
+        await self.dispatch(EventType.ROOM_MESSAGE, MaubotMessageEvent(event, self.client))
+
+
+def make_message(
+    content,
+    html=None,
+    room_id="testroom",
+    msg_type=MessageType.TEXT,
+    sender="@dummy:example.com",
+    timestamp=None,
+):
+    """Make a Matrix message event."""
+    return MessageEvent(
+        type=EventType.ROOM_MESSAGE,
+        room_id=room_id,
+        event_id="test",
+        sender=sender,
+        timestamp=timestamp or int(time.time()),
+        content=TextMessageEventContent(msgtype=msg_type, body=content, formatted_body=html),
+    )
diff --git a/maubot/testing/fixtures.py b/maubot/testing/fixtures.py
new file mode 100644
index 0000000..13b74e2
--- /dev/null
+++ b/maubot/testing/fixtures.py
@@ -0,0 +1,135 @@
+# maubot - A plugin-based Matrix bot system.
+# Copyright (C) 2023 Aurélien Bompard
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+from pathlib import Path
+import asyncio
+import logging
+
+from ruamel.yaml import YAML
+import aiohttp
+import pytest
+import pytest_asyncio
+
+from maubot import Plugin
+from maubot.loader import PluginMeta
+from maubot.standalone.loader import FileSystemLoader
+from mautrix.util.async_db import Database
+from mautrix.util.config import BaseProxyConfig, RecursiveDict
+from mautrix.util.logging import TraceLogger
+
+from .bot import TestBot
+
+
+@pytest_asyncio.fixture
+async def maubot_test_bot():
+    return TestBot()
+
+
+@pytest.fixture
+def maubot_upgrade_table():
+    return None
+
+
+@pytest.fixture
+def maubot_plugin_path():
+    return Path(".")
+
+
+@pytest.fixture
+def maubot_plugin_meta(maubot_plugin_path):
+    yaml = YAML()
+    with open(maubot_plugin_path.joinpath("maubot.yaml")) as fh:
+        plugin_meta = PluginMeta.deserialize(yaml.load(fh.read()))
+    return plugin_meta
+
+
+@pytest_asyncio.fixture
+async def maubot_plugin_db(tmp_path, maubot_plugin_meta, maubot_upgrade_table):
+    if not maubot_plugin_meta.get("database", False):
+        return
+    db_path = tmp_path.joinpath("maubot-tests.db").as_posix()
+    db = Database.create(
+        f"sqlite:///{db_path}",
+        upgrade_table=maubot_upgrade_table,
+        log=logging.getLogger("db"),
+    )
+    await db.start()
+    yield db
+    await db.stop()
+
+
+@pytest.fixture
+def maubot_plugin_class():
+    return Plugin
+
+
+@pytest.fixture
+def maubot_plugin_config_class():
+    return BaseProxyConfig
+
+
+@pytest.fixture
+def maubot_plugin_config_dict():
+    return {}
+
+
+@pytest.fixture
+def maubot_plugin_config_overrides():
+    return {}
+
+
+@pytest.fixture
+def maubot_plugin_config(
+    maubot_plugin_path,
+    maubot_plugin_config_class,
+    maubot_plugin_config_dict,
+    maubot_plugin_config_overrides,
+):
+    yaml = YAML()
+    with open(maubot_plugin_path.joinpath("base-config.yaml")) as fh:
+        base_config = RecursiveDict(yaml.load(fh))
+    maubot_plugin_config_dict.update(maubot_plugin_config_overrides)
+    return maubot_plugin_config_class(
+        load=lambda: maubot_plugin_config_dict,
+        load_base=lambda: base_config,
+        save=lambda c: None,
+    )
+
+
+@pytest_asyncio.fixture
+async def maubot_plugin(
+    maubot_test_bot,
+    maubot_plugin_db,
+    maubot_plugin_class,
+    maubot_plugin_path,
+    maubot_plugin_config,
+    maubot_plugin_meta,
+):
+    loader = FileSystemLoader(maubot_plugin_path, maubot_plugin_meta)
+    async with aiohttp.ClientSession() as http:
+        instance = maubot_plugin_class(
+            client=maubot_test_bot.client,
+            loop=asyncio.get_running_loop(),
+            http=http,
+            instance_id="tests",
+            log=TraceLogger("test"),
+            config=maubot_plugin_config,
+            database=maubot_plugin_db,
+            webapp=None,
+            webapp_url=None,
+            loader=loader,
+        )
+        await instance.internal_start()
+        yield instance
diff --git a/optional-requirements.txt b/optional-requirements.txt
index 6d87db3..0e45b97 100644
--- a/optional-requirements.txt
+++ b/optional-requirements.txt
@@ -5,3 +5,7 @@
 python-olm>=3,<4
 pycryptodome>=3,<4
 unpaddedbase64>=1,<3
+
+#/testing
+pytest
+pytest-asyncio
diff --git a/setup.py b/setup.py
index 24f9e00..79a0c6c 100644
--- a/setup.py
+++ b/setup.py
@@ -57,6 +57,8 @@ setuptools.setup(
     entry_points="""
         [console_scripts]
         mbc=maubot.cli:app
+        [pytest11]
+        maubot=maubot.testing
     """,
     data_files=[
         (".", ["maubot/example-config.yaml"]),